How to asynchronously wait the query result

[blob84]

Hello this is the code to make a query:

GraphClient client = ...;

...

Storefront.QueryRootQuery query = Storefront.query(rootQuery -> rootQuery
  .shop(shopQuery -> shopQuery
    .name()
    .currencyCode()
    .refundPolicy(refundPolicyQuery -> refundPolicyQuery
      .title()
      .url()
    )
  )
);

client.queryGraph(query).enqueue(new GraphCall.Callback<Storefront.QueryRoot>() {

  @Override public void onResponse(@NonNull GraphResponse<Storefront.QueryRoot> response) {
    String name = response.data().getShop().getName();
    String currencyCode = response.data().getShop().getCurrencyCode().toString();
    String refundPolicyUrl = response.data().getShop().getRefundPolicy().getUrl();
  }

  ...
});

I need that the processed data in the onResponse method should be available outside it. I need to wait (non-blocking) these data and use them in the future elsewhere.

I tried with CompletabeFuture but I get the Storefront.QueryRoot memory address:

        CompletableFuture<GraphResponse> completableFuture
                = CompletableFuture.supplyAsync(() -> {
            try {
                return call.execute();
            } catch (GraphError graphError) {
                graphError.printStackTrace();
                return null;
            }
        });

        CompletableFuture<String> future = completableFuture
                .thenApply(response ->  response.data().toString());

        try {
            responseData = future.get();

        } catch (ExecutionException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

[blob84]

I forgot the type GraphResponse<Storefront.QueryRoot>. It works with CompletableFuture. If I run the code without CompletableFuture I get error:

       try {
            GraphResponse<Storefront.QueryRoot> gresponse =  call.execute();
           responseData = gresponse.data().getShop().getName();
        } catch (GraphError graphError) {
            System.out.println("hello qui");
            graphError.printStackTrace();
        }

error: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.domain.shopifyapp/com.domain.shopifyapp.MainActivity}: android.os.NetworkOnMainThreadException

Let me know if there is a solution better than CompletableFuture . Thanks.